Get the first 4 digits of each element of an array

Question

I have an array which i got from an sql database, and each element is saved as YYYY-MM-DD. but i only need the year of each element. My current code:

if(isset($_GET['date'])){
$dates= unserialize(urldecode($_GET['date']));
foreach($dates as $i){
$year = substr($i, 0, 4);
}}
print_r($year);

but when i run the code it only gives me the year of the first element

i already tried array_slice but that didnt work either

Answer 1

if(isset($_GET['date'])) {
    $dates= unserialize(urldecode($_GET['date']));
    $year = array();
    foreach($dates as $i) {
        $year[] = substr($i, 0, 4);
    }
}
print_r($year);

2 little changes that will fix it.